Time delay behavior of heterodyne acousto-optic systems

Robert J. Berinato

doi:10.1117/12.179109

29 June 1994 Time delay behavior of heterodyne acousto-optic systems

Robert J. Berinato

Proceedings Volume 2240, Advances in Optical Information Processing VI; (1994) https://doi.org/10.1117/12.179109
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

In this paper it is shown that the reference beam for true time delay operation of a heterodyne system must be carefully chosen to achieve proper signal time delay behavior. True time delay is defined here as an equivalent delay of the envelope and carrier frequency of a carrier-modulated waveform, resulting in no apparent phase shift of the envelope. For acousto-optic (AO) tapped delay lines, or more complex AO systems utilized for tapped delay line filters, signal excisors, or beamformers, the reference beam must be equivalent to the undiffracted beam exiting the AO device in order to achieve true time delay. Two examples are used to demonstrate the application of the time delay concepts described in the paper. The first example is a heterodyne transform architecture that uses an external reference beam to select a tap position within an AO cell. The second example is an AO tapped delay line filter that employs the undiffracted beam from the AO interaction as the reference beam.

Citation Download Citation

Robert J. Berinato "Time delay behavior of heterodyne acousto-optic systems", Proc. SPIE 2240, Advances in Optical Information Processing VI, (29 June 1994); https://doi.org/10.1117/12.179109

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